[leveller] Re: New Deterrace plug-in being made
- From: "Carl Lingard" <lingardc@xxxxxxxxxxxxx>
- To: <leveller@xxxxxxxxxxxxx>
- Date: Mon, 4 Feb 2008 22:26:11 -0000
Here's an area we recently had trouble with
http://www.skindustry.net/medem/files/Temp/shptest.rar
We were getting totally flat areas where they should have been close to
flat.
Carl
----- Original Message -----
From: "Ray Gardener" <rayg@xxxxxxxxxxxxxxxxxx>
To: <leveller@xxxxxxxxxxxxx>
Sent: Monday, February 04, 2008 9:12 AM
Subject: [leveller] Re: New Deterrace plug-in being made
The new algorithm is essentially done now, so if anyone has shapefile
contours they would like me to use for incorporating a vector input, I'm
happy to give that a whirl. ESRI shapefiles are easiest; other formats I'd
have to enable OGR in GDAL and do some extra coding.
Speed improvement over the old Deterrace is only around 15-20 percent, not
as much as I hoped; but the accuracy is definitely better. Artifacts are
also resolved much better on tightly convoluted areas.
Those wanting to give the new Deterrace a whirl can download it from:
http://www.daylongraphics.com/products/leveller/plugins/download/deterrace.ltf
(backup your existing deterrace.ltf file if you want to keep the old one.)
The sample screenshot at
http://www.daylongraphics.com/products/leveller/gallery/deterrace2.png
was updated showing some fixes. The contour lines are still a bit visible
but this is due to slope changes. Blurring afterwards of course helps out.
Ray
Carl Lingard wrote:
Hi Ray, one of the problems we have is that we have contour maps which
can have huge distances between them (in the xy plane). Global Mapper,
while having other advatages such as being able to handle very large
datasets, does seem to leave large flat areas. Would this algo help avoid
that?
Would this algo be able to interpolate for eg shp file contours
(presuming shp file support)?
Carl
----- Original Message ----- From: "Ray Gardener"
<rayg@xxxxxxxxxxxxxxxxxx>
To: <leveller@xxxxxxxxxxxxx>
Sent: Sunday, February 03, 2008 7:24 AM
Subject: [leveller] New Deterrace plug-in being made
A new algorithm for the Deterrace plug-in is under development. When
completed it should be both faster and more accurate.
Screenshot:
http://www.daylongraphics.com/products/leveller/gallery/deterrace2.png
The above sample (1000 pixels square) shows the preexisting contour
lines, which are handy as a reference but technically should not be
present.
Unlike the old algorithm, large terrain resolution and/or large plateaus
do not leave flat unprocessed areas; every pixel gets fully evaulated.
Ray
Other related posts:
